Self-Employed Retirement Plans Estimate the maximum contribution amount for a Self-Employed 401(k), SIMPLE IRA, or SEP. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Content Your Shifting Risk Tolerance Time and market performance may subtly and slowly imbalance your portfolio. What Is a Roth 401(k)? Roth 401(k) plans combine features of traditional 401(k) plans with those of a Roth IRA. Impact of Taxes and Inflation Estimate the potential impact taxes and inflation can have on the purchasing power of an investment.